163135381 has 2 divisors, whose sum is σ = 163135382. Its totient is φ = 163135380.

The previous prime is 163135369. The next prime is 163135439. The reversal of 163135381 is 183531361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136188900 + 26946481 = 11670^2 + 5191^2 .

It is a cyclic number.

It is not a de Polignac number, because 163135381 - 2¹⁵ = 163102613 is a prime.

It is a super-2 number, since 2×163135381² = 53226305068030322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163135681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81567690 + 81567691.

It is an arithmetic number, because the mean of its divisors is an integer number (81567691).

Almost surely, 2^163135381 is an apocalyptic number.

It is an amenable number.

163135381 is a deficient number, since it is larger than the sum of its proper divisors (1).

163135381 is an equidigital number, since it uses as much as digits as its factorization.

163135381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 163135381 is about 12772.4461635193. The cubic root of 163135381 is about 546.4067476374.

The spelling of 163135381 in words is "one hundred sixty-three million, one hundred thirty-five thousand, three hundred eighty-one".